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Protective effects of tetramethylpyrazine on dysfunction of the locus coeruleus in rats exposed to single prolonged stress by anti-ER stress mechanism
Psychopharmacology ( IF 3.5 ) Pub Date : 2021-07-07 , DOI: 10.1007/s00213-021-05908-6
Yun Hou 1 , Meifeng Li 2 , Yinchuan Jin 3 , Feibo Xu 1 , Shaohua Liang 4 , Chen Xue 5 , Kaili Wang 5 , Wei Zhao 1
Affiliation  

Post-traumatic stress disorder (PTSD) is a serious stress-related neuropsychiatric disorder caused by major traumatic events. Abnormal activity of the locus coeruleus (LC)-noradrenergic system is related to the development of PTSD-like symptoms. Our previous studies have indicated that endoplasmic reticulum (ER) stress induced neuronal apoptosis of LC in rats with PTSD. The purpose of this study was to further investigate the role of ER stress pathways in LC neuronal dysfunction and elucidate the effect of the bioactive component tetramethylpyrazine (TMP) against ER stress response. We used an acute exposure to single prolonged stress (SPS) to model PTSD in rats. There were higher norepinephrine (NE) levels in the brain, increased tyrosine hydroxylase expression in LC, and enhanced anxiety-like behaviors in rats exposed to SPS, which were observed by enzyme-linked immunosorbent assay, western blot analysis and elevated plus maze test, respectively. In addition, the three major pathways of ER stress were activated by SPS exposure, which may be involved in the dysregulation of the LC-noradrenergic system of rats with PTSD. Furthermore, we found that TMP administration significantly suppressed the increased responsiveness of LC-noradrenergic system, effectively reduced the anxiety response of SPS rats, and selectively attenuated the activation of pro-apoptotic ER stress pathways. The results suggest that TMP was efficient in improving the LC-NE dysfunction induced by excessive ER stress. TMP exhibited a significant neuroprotective effect and potential therapeutics on PTSD-like symptoms.



中文翻译:

四甲基吡嗪通过抗ER应激机制对单一长期应激大鼠蓝斑功能障碍的保护作用

创伤后应激障碍(PTSD)是一种由重大创伤事件引起的与压力相关的严重神经精神障碍。蓝斑(LC)-去甲肾上腺素能系统的异常活动与 PTSD 样症状的发展有关。我们之前的研究表明,内质网 (ER) 应激诱导了 PTSD 大鼠 LC 的神经元凋亡。本研究的目的是进一步研究内质网应激通路在 LC 神经元功能障碍中的作用,并阐明生物活性成分四甲基吡嗪 (TMP) 对内质网应激反应的影响。我们使用急性暴露于单一长期压力 (SPS) 来模拟大鼠的 PTSD。大脑中去甲肾上腺素 (NE) 水平较高,LC 中酪氨酸羟化酶表达增加,暴露于 SPS 的大鼠的焦虑样行为增强,分别通过酶联免疫吸附试验、蛋白质印迹分析和高架十字迷宫试验观察到。此外,SPS暴露激活了ER应激的三大途径,这可能与PTSD大鼠LC-去甲肾上腺素能系统失调有关。此外,我们发现 TMP 给药显着抑制 LC-去甲肾上腺素能系统的反应性增加,有效降低 SPS 大鼠的焦虑反应,并选择性地减弱促凋亡 ER 应激途径的激活。结果表明,TMP 可有效改善由过度内质网应激引起的 LC-NE 功能障碍。TMP 对 PTSD 样症状表现出显着的神经保护作用和潜在的治疗作用。分别。此外,SPS暴露激活了ER应激的三大途径,这可能与PTSD大鼠LC-去甲肾上腺素能系统失调有关。此外,我们发现 TMP 给药显着抑制 LC-去甲肾上腺素能系统的反应性增加,有效降低 SPS 大鼠的焦虑反应,并选择性地减弱促凋亡 ER 应激途径的激活。结果表明,TMP 可有效改善由过度内质网应激引起的 LC-NE 功能障碍。TMP 对 PTSD 样症状表现出显着的神经保护作用和潜在的治疗作用。分别。此外,SPS暴露激活了ER应激的三大途径,这可能与PTSD大鼠LC-去甲肾上腺素能系统失调有关。此外,我们发现 TMP 给药显着抑制 LC-去甲肾上腺素能系统的反应性增加,有效降低 SPS 大鼠的焦虑反应,并选择性地减弱促凋亡 ER 应激途径的激活。结果表明,TMP 可有效改善由过度内质网应激引起的 LC-NE 功能障碍。TMP 对 PTSD 样症状表现出显着的神经保护作用和潜在的治疗作用。此外,我们发现 TMP 给药显着抑制了 LC-去甲肾上腺素能系统的反应性增加,有效降低了 SPS 大鼠的焦虑反应,并选择性地减弱了促凋亡 ER 应激通路的激活。结果表明,TMP 可有效改善由过度内质网应激引起的 LC-NE 功能障碍。TMP 对 PTSD 样症状表现出显着的神经保护作用和潜在的治疗作用。此外,我们发现 TMP 给药显着抑制 LC-去甲肾上腺素能系统的反应性增加,有效降低 SPS 大鼠的焦虑反应,并选择性地减弱促凋亡 ER 应激途径的激活。结果表明,TMP 可有效改善由过度内质网应激引起的 LC-NE 功能障碍。TMP 对 PTSD 样症状表现出显着的神经保护作用和潜在的治疗作用。

更新日期:2021-07-07
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